Best tranny setup for my a-100 van??

I think it all comes down to your personal preference and how much work you're willin' to put into the project. I the three speed and linkage is working and you're OK driving it, the easiest thing would be to bolt the 225 to the tranny you have and be happy.

Putting the 225& 904 into the van will take some fabrication for the shift linkage and kickdown, but I'm pretty sure you can just remove the clutch pedal. Good luck!

BC